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This report describes the March 1994 Arctic deployment undertaken by the Acoustic Telemetry Group of WHOI. The
deployment was a part of the 1994 Sea Ice Mechanics Initiative (SIMI) project and was based at the west SIMI camp,
approximately 150 nautical miles north-east of Prudhoe Bay, Alaska. The goal of the deployment was to install a network of
six high-performance acoustic modems, developed at WHOI, and to obtain a data set demonstrating the communications
and acoustic monitoring capabilties of the network.
The six modems in the network were deployed over an area of 22 square km and communicated via radio Ethernet with a
computer at the SIMI camp. Each model had a global positioning system, an acoustic source and an 8 element receiving
array. The network was operated in a round-robin broadcast mode (i.e., each modem in turn transmitted a packet of data
while the others received). The transmissions were 5000 bits-per-second QPSK with a 15kHz carrier. An extensive data set
including raw acoustic data source localization information, and modem position was collected during the deployment.
An additional function of the acoustic network was to communicate with, and track, the Odyssey, an autonomous
underwater vehicle operated by the MIT group at the SIMI camp. To this end, the Odyssey was equipped with a Datasonics
modem configured for periodic QPSK transmission to the network. A data set was obtained from which both the up-link
communication and localization capabilties of the network can be determined.

Ocean bottom seismometer observations at 5000 m depth during the long-range ocean acoustic propagation experiment in the North Pacific in 2004 show robust, coherent, late arrivals that are not readily explained by ocean ...

A study of 400 Hz sound focusing and ducting effects in a packet of curved nonlinear internal waves in shallow water is presented. Sound propagation roughly along the crests of the waves is simulated with a three-dimensional ...

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